Frequencies for first 10,000 rows of prov6190 variable in pos2006 dataset :

       srv: |
gerontologi |
        cal |
  specialty |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |      1,279       12.79       99.89
          1 |         10        0.10       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016